From App Annie’s quarterly analysis of the iOS App Store and Google Play revenues.

Chart 1 shows app downloads for each store, in billions:

As you can see, Google Play has about 2-1/2 times the number of downloads as the iOS App Store.

Now let’s look at revenue:

The conclusion from this chart? Customers for the iOS App Store spend almost twice as much as Google Play customers.

That’s a pretty big swing.